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The R&S UPD Audio Analyzer performs practically all types of audio measurement, from frequency response measurements through to exteally controlled sweeps with reference traces, determination of 3rd-order difference frequency distortion, spectral display of demodulated wow and flutter signals, etc. In contrast to many other audio analyzers, the R&S UPD is capable of performing real dual-channel…
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The R&S UPD Audio Analyzer performs practically all types of audio measurement, from frequency response measurements through to exteally controlled sweeps with reference traces, determination of 3rd-order difference frequency distortion, spectral display of demodulated wow and flutter signals, etc. In contrast to many other audio analyzers, the R&S UPD is capable of performing real dual-channel measurements in the audio-frequency range, ie there is no need for switchover between two inputs and this type of measurement is not limited to a few special cases.
The generator is every bit as versatile: it supplies any conceivable signal from sinewave and noise signals through to multi-sinewave signals comprising up to 7400 frequencies.
In addition to all this, the UPD Audio Analyzer features excellent technical data: analog sinewave generation with harmonics of typ. -120 dB, spectrum displays with a noise floor below -140 dB for analog and -160 dB for digital interfaces, FFT with a maximum frequency resolution of 0.02 Hz, etc.
The R&S UPD provides signal monitoring via loudspeaker, jitter measurements on digital audio signals, resynchronization of jittered digital audio signals by means of a jitter-free clock signal, and many more features.
The Rohde & Schwarz UPD Audio Analyzer performs all measurements using digital signal processing. Analog signals to be tested undergo elaborate preprocessing before they are digitized and measured by means of digital routines. For example, in THD measurements, the fundamental is attenuated by means of a notch filter and the residual signal amplified by 30 dB before it is digitized. In this way, the dynamic range can be extended beyond that offered by the inteal converter. This provides sufficient margin for measuring converters of the future, which will be technically more advanced than those of present-day technology (see graph on the right). This concept guarantees performance and flexibility by far superior to instruments providing purely analog or digital measurements.
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